| Title |
Analysis of Soil lonization Characteristics in Concentric Cylindrical Electrode System under Impulse Voltages |
| Authors |
Hoe-Gu Kim ; Geon-Hun Park ; Bok-Hee Lee |
| Keywords |
Soil lonization ; V-1 Curve ; Soil Resistivity ; Impulse Voltage ; Transient Grounding Impedance |
| Abstract |
This paper presents the soil ionization phenomena and the parameters with the transient characteristics of model grounding system under lightning impulse voltages. Ionization properties of dry and wet sands were investigated by using two test cells of concentric cylindrical electrode system with different dimensions. As a result, non-linear electrical behavior of sand under high impulse voltage is caused by ionization process. The transient impedance of sand depends not only on the water content but also on the magnitude of applied impulse voltages. The grounding impedance is decreased with increasing the water content and the magnitude of applied voltages. The results presented in this paper will provide useful information on the design of high performance grounding systems against lightning surge. |